Django-在模板内设置变量（或在参数为函数的情况下调用IF语句）

Question

I have a (template tag - simple_tag) function, which takes 1 argument (and context) and returns a string. So calling {% myfunction var1 %} returns a string (depended on var1).

Now I want to use this inside a if statement, something like: {% if myfunction var1 == 'some string' %} . Obviously that doesn't work, so I have tried to firstly save returned string to a variable and then use it in if statement.

But {% myfunction var1 as var2 %} doesn't work because it treats "as var2" as a second function argument and I get the "received too many positional arguments" error.

I have tried the "with" statement also, but it doesn't work either...

So how can I save the function return value to a variable OR how can I directly use a function inside if statement ??

Answer 1

You can register your template tag using django.template.Library.assignment_tag() and then use {% myfunction var1 as var2 %} in your template. https://docs.djangoproject.com/en/dev/howto/custom-template-tags/#assignment-tags

Answer 2

You could make it a filter instead of a tag. Then you can use it in an if statement:

{% if var1|myfunction == 'some string' %}

as well as just standalone:

{{ var1|myfunction }}